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Summary

Discontinuous pith cavities in Alternanthera philoxeroides stems facilitate oxygen transport, crucial for plant growth under hypoxic conditions. Blocking these pathways significantly reduces oxygen supply and hinders overall plant development.

Keywords:
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Area of Science:

  • Plant Biology
  • Physiology
  • Ecology

Background:

  • Alternanthera philoxeroides is a flood-tolerant plant facing hypoxic stress.
  • Its stem pith cavity is interrupted by nodal diaphragms, raising questions about internal gas transport functionality.

Purpose of the Study:

  • To investigate the role of discontinuous stem pith cavities in internal gas transport.
  • To assess oxygen (O2) transport capacity, tissue O2 status, and growth responses to restricted O2 supply.

Main Methods:

  • Assessed diffusive O2 transport capacity in stems.
  • Measured tissue O2 status in intact plants.
  • Evaluated whole-plant growth under partial submergence with manipulated O2 supply.

Main Results:

  • Stem pith cavities are the primary pathway for O2 diffusion.
  • Blocking even one internode significantly reduced O2 flux to lower sections.
  • Reduced O2 flux led to decreased growth in partially submerged plants.

Conclusions:

  • Discontinuous pith cavities are functional for internal O2 transport in Alternanthera philoxeroides.
  • This transport is vital for maintaining plant growth under submergence.
  • A predictive model was developed for comparing O2 transport across species.